Tesla investors expect a merger with SpaceX. With all-stock tie-ups, be careful what you wish for. Just look at Marvell and Lumentum.

British telecoms group Virgin Media O2 said Tuesday that it would cut thousands of jobs in a sweeping cost-saving programme, helped by greater use of AI, to reduce its debt pile.

Many of the new drug treatments that created waves at a major cancer medicine conference last month were invented in China. Observers failed to see the impending downturns in 1873, 1929, and 2000. And ...